R'an Shi Deepwater

Nimble (If this creature would be dealt damage, flip
a coin. If you win the flip, prevent that damage.)
When R'an Shi Deepwater attacks, create a
legendary 3/3 blue Shark creature token with
Nimble, named K'van tapped and attacking,
Exile it at the beginning of the next end step.
Other Merfolk you control have Nimble.